How do I refine the mesh in a certain region of my flow domain? For example, if I have a flow past a bluff body and I want to capture the vortices past (downstream) the bluff body accurately, how do I do this?

In Gambit, I can simply "split" the volume and mesh that portion of interest separately. Can this be done in ICEM? Please advise, O' Wise Ones! Cheers!